With a Rossi .45 in front (mistake) I had to do some creative thinking. I opened up the center former hole, and cut the throttle portion of the servo tray off slid a new 200cc fuel tank back to the fwd servo (at the CG!). Glued a Hitech 55 micro throttle servo to the fues side, fwd of the tank. Glued the switch to the aft former and servo tray with a rod exiting the bottom. Mounted the battery (4 cell Nmhi flat pack) to the bottom of the wing with servo tape and a rubberband mount I fab'd. It rides about a 1/4 inch above the push rods. It was still nose heavy, had to add about 2oz to the tail. Got a OS 32sx on the way I'm pulling the Rossi for my new Aresti.
Buy the way RCONTROLFREAK, my first Magic fues snapped right behind the wing in flight the second time out. The 4 pull-pull rods held it together long enough for me to land it. Hobby People replaced it. I'll try and attach pics